Really not that hard to fix as per the link provided above by paulbrice (How To - Repair leaking spoke nipples) and well worth the effort if you prefer the look of the spoked wheels, which I do.
The most important thing is to identify the leaking spoke seals which you can only do effectively by immersing the wheel rim in water as shown. A spray of soapy water is unlikely to confirm the leakers as it can take a few minutes under water before bubbles are evident.
It is also important to check your spoke tension periodically.
If all else fails there is also the Outrex solution mentioned further on in the post.[You must be registered and logged in to see this link.]
I have used this and it works.